Explanation:

• Our Common Future: Our Common Future, also known as the Brundtland Report was published in 1987 by the United Nations. Its targets were multilateralism and interdependence of nations in the search for a sustainable development path. The report sought to recapture the spirit of the Stockholm Conference which had introduced environmental concerns to the formal political development sphere. Our Common Future placed environmental issues firmly on the political agenda; it aimed to discuss the environment and development as one single issue.
• Limits to Growth: The Limits to Growth is a 1972 report on the computer simulation of exponential economic and population growth with a finite supply of resources. It is commissioned by the Club of Rome. The authors of the report intended to explore the possibility of a sustainable ecological and economic stability along with economic growth.
• Agenda-21: Agenda 21 is a non-binding action plan of the United Nations with regard to sustainable development. It is a product of the Earth Summit (UN Conference on Environment and Development) held in Rio de Janeiro, Brazil, in 1992. It is an action agenda for the UN, other multilateral organizations, and individual governments around the world that can be executed at local, national, and global levels. o Hence option d is the correct answer.